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The essential difference between two-color injection molding and in-mold injection molding

【two】How to choose between two-color injection molding and in-mold injection molding​https://doi.org/10.1016/j.jmapro.2024.02.021 ​B. Products with multi-colored appearance and no surface treatment​The appearance material is hard glue in multiple colors and does not undergo surface treatment. Most of them are used in light-transmitting products.For example: keyboard buttons, mouse, mobile phone protective case, etc. As shown below: C, …

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Structural design of plastic parts: chamfering

The most commonly used chamfers are divided intoRoundandchamferRounding refers to connecting two curved surfaces of a part tangently through a rounded surface. A standard rounded corner usually uses a radius value R to represent its size. Structural design of plastic parts: chamfering Chamfering refers to connecting two curved surfaces of a part at an angle …

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Injection molding process of polyethylene PE

PE is a crystalline raw material with very little hygroscopicity, no more than 0.01%, so there is no need for drying before processing. PE molecular chains have good flexibility, small forces between bonds, low melt viscosity, and excellent fluidity. Therefore, thin-walled long-flow products can be formed without too high pressure during molding. The shrinkage range …

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Selection tips for plastic mold materials

The working conditions of plastic molds are different from those of cold stamping dies. They generally have to work at 150 degrees Celsius to 200 degrees Celsius. In addition to being subject to a certain pressure, they also have to withstand the influence of temperature. According to the different usage conditions and processing methods of …

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Injection Molding Pre-molding Action And Back Pressure Control

Pre-molding action selection Depending on whether the injection seat retreats before and after pre-plastic feeding, that is, whether the nozzle leaves the mold, the injection molding machine generally has three options: Fixed feeding: the nozzle is always attached to the mold before and after pre-molding, and the injection seat does not move. Front feeding: The …

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Plastic gear parts injection molding process and material analysis

Plastic gear parts injection molding process and material analysis. Plastic gears are developing toward larger sizes, more complex geometries, and higher strength, with high-performance resins and long-glass fiber-filled composites playing an important role. Plastic gears have experienced a change from new materials to important industrial materials in the past 50 years. Today they have penetrated …

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The Main Problems Of Common Defects In Injection Molded Products

Not enough (lack of glue) Process problems: plasticizing temperature is too low, nozzle temperature is too low, injection time is too short, injection speed is too slow, mold temperature is too low. Mold problems: the runner is too small, the gate is too small, the gate position is unreasonable, the exhaust is poor, and there …

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How To Solve These Four Common Problems Encountered In Injection Molding

Solutions to bubbles appearing during injection molding Causes and solutions of bubbles When the wall thickness of the product is large, the outer surface cools faster than the central part. Therefore, as the cooling proceeds, the plastic resin in the central part shrinks and expands toward the surface, causing insufficient filling of the central part. …

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